nhanesManifest: Download and parse NHANES manifests

In nhanesA: NHANES Data Retrieval

Download and parse NHANES manifests

Description

Downloads and parses NHANES manifests for public data (available at https://wwwn.cdc.gov/Nchs/Nhanes/search/DataPage.aspx), limited access data (https://wwwn.cdc.gov/Nchs/Nhanes/search/DataPage.aspx?Component=LimitedAccess), and variables (https://wwwn.cdc.gov/nchs/nhanes/search/variablelist.aspx?Component=Demographics, etc.), and returns them as data frames.

Usage

nhanesManifest(
  which = c("public", "limitedaccess", "variables"),
  sizes = FALSE,
  dxa = FALSE,
  verbose = getOption("verbose"),
  use_cache = TRUE,
  max_age = 24 * 60 * 60
)

Arguments

which	Either "public" or "limitedaccess" to get a manifest of available tables, or "variables" to get a manifest of available variables.
sizes	Logical, whether to compute data file sizes (as reported by the server) and include them in the result.
dxa	Logical, whether to include information on DXA tables. These tables contain imputed imputed Dual Energy X-ray Absorptiometry measurements, and are listed separately, not in the main listing.
verbose	Logical flag indicating whether information on progress should be reported.
use_cache	Logical flag indicating whether a cached version (from a previous download in the same session) should be used.
max_age	Maximum allowed age of the cache in seconds (defaults to 24 hours). Cached versions that are older are ignored, even if available.

Value

A data frame, with columns that depend on which. For a manifest of tables, columns are "Table", "DocURL", "DataURL", "Years", "Date.Published". If sizes = TRUE, an additional column "DataSize" giving the data file sizes in bytes (as reported by the server) is included. For limited access tables, the "DataURL" and "DataSize" columns are omitted. For a manifest of variables, columns are "VarName", "VarDesc", "Table", "TableDesc", "BeginYear", "EndYear", "Component", and "UseConstraints".

Note

Duplicate rows are removed from the result. Most of these duplicates arise from duplications in the source tables for multi-cycle tables (which are repeated once for each cycle). One special case is the WHQ table which has two variables, WHD120 and WHQ030, duplicated with differing variable descriptions. These are removed explicitly, keeping only the first occurrence.

Examples

manifest <- nhanesManifest(sizes = FALSE)
dim(manifest)

nhanesA documentation built on July 4, 2024, 9:08 a.m.